E336: Monopotassium tartrate

What is E336?

Monopotassium tartrate (E336i), widely known as cream of tartar, is the acidic potassium salt of tartaric acid. It is a fine white powder with a tart taste.

Origin and production

It crystallises naturally during wine-making, forming deposits in barrels and on corks. These crude tartrates are collected and purified to produce food-grade cream of tartar.

Why is it used?

In baking powders and cake mixes it reacts with sodium bicarbonate to release carbon dioxide and leaven cakes and biscuits. Home cooks also use it to stabilise whipped egg whites for meringues and to prevent sugar syrups from crystallising.

Vegan, vegetarian and halal

Cream of tartar is plant-derived and generally suitable for vegans and vegetarians. Although it comes from wine production, it contains no alcohol; halal acceptance can vary, so certification is the clearest indicator.

Safety and regulation

E336 is authorised in the EU and has been evaluated by EFSA within the tartaric acid and tartrates group.

Common in